What is the best engine option for a Ford Focus?

I am currently looking to purchase a Ford Focus and am wondering which engine option would be the best choice for long-term reliability and performance. I've heard conflicting opinions and am looking for some expert advice.

For a long-lasting and efficient engine, I highly recommend going with the Ecoboost option in the Ford Focus. It offers a perfect balance of power and fuel efficiency.

As a mechanic, I have seen many issues with the Ecoboost engines in the Ford Focus. In my opinion, the standard gasoline option would be a better choice.

After owning a Ford Focus for over 5 years, I can confidently say that the diesel engine has been the most reliable and economical choice for me.